It could be implemented some extra grants, but this it\'ll made more complex to set, that was one of our internal discussions not yet finished. For example seems interesting to implement \"modify grants\" as a separated grant from \"write access\".
Really it could be implemented, delete, and \"modify grants\", but meanwhile we\'re thinking the best way to do it to continue having a easy end user system, you\'ll must be patient. Since now we\'ve haven\'t founded and easy solution that increasing grants continues beeing easy for end user to undertand it, we\'re playing with several options, and we\'re not happy with any.
We know it\'s something to do since version 2.0. but we\'ve still not found - for us - the easy and correct way to do ( and the exact number of grants to increase, for us we\'ve accepted \"modify grants\" as a new, but \"delete\" is not so clear for default installation -> could be something to parametrize -> hope you understand it ).
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OpenKM Team ( be open my friend )
http://www.openkm.com